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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a6ec966a7cfe5da38220e5fc62e884be6d0b9b50c612b8157556b97be98ef4' 
  AND token = 'cjUOH1ku3En8HL7nzV+GhXKNXsdrc6ee3zGtv5Sqy90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}